I am fairly new to knitting, I've only done felted projects that are very forgiving. I'm making a scarf with cables now, I was doing well, I'm on the 10th row and I realized that I only have 41 stitches and I am supposed to have 42 stitches. What should i do, I can't figure out where i dropped the stitch. should I just pick up a stitch somewhere, and if so ,how and where would I do that?